94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
/*
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* fscrypt_private.h
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*
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* Copyright (C) 2015, Google, Inc.
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*
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* This contains encryption key functions.
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*
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* Written by Michael Halcrow, Ildar Muslukhov, and Uday Savagaonkar, 2015.
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*/
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#ifndef _FSCRYPT_PRIVATE_H
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#define _FSCRYPT_PRIVATE_H
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#include <linux/fscrypto.h>
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#define FS_FNAME_CRYPTO_DIGEST_SIZE 32
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/* Encryption parameters */
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#define FS_XTS_TWEAK_SIZE 16
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#define FS_AES_128_ECB_KEY_SIZE 16
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#define FS_AES_256_GCM_KEY_SIZE 32
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#define FS_AES_256_CBC_KEY_SIZE 32
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#define FS_AES_256_CTS_KEY_SIZE 32
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#define FS_AES_256_XTS_KEY_SIZE 64
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#define FS_MAX_KEY_SIZE 64
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#define FS_KEY_DESC_PREFIX "fscrypt:"
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#define FS_KEY_DESC_PREFIX_SIZE 8
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#define FS_KEY_DERIVATION_NONCE_SIZE 16
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/**
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* Encryption context for inode
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*
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* Protector format:
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* 1 byte: Protector format (1 = this version)
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* 1 byte: File contents encryption mode
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* 1 byte: File names encryption mode
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* 1 byte: Flags
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* 8 bytes: Master Key descriptor
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* 16 bytes: Encryption Key derivation nonce
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*/
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struct fscrypt_context {
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u8 format;
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u8 contents_encryption_mode;
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u8 filenames_encryption_mode;
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u8 flags;
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u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
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u8 nonce[FS_KEY_DERIVATION_NONCE_SIZE];
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} __packed;
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#define FS_ENCRYPTION_CONTEXT_FORMAT_V1 1
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/* This is passed in from userspace into the kernel keyring */
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struct fscrypt_key {
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u32 mode;
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u8 raw[FS_MAX_KEY_SIZE];
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u32 size;
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} __packed;
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/*
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* A pointer to this structure is stored in the file system's in-core
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* representation of an inode.
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*/
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struct fscrypt_info {
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u8 ci_data_mode;
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u8 ci_filename_mode;
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u8 ci_flags;
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struct crypto_skcipher *ci_ctfm;
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struct key *ci_keyring_key;
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u8 ci_master_key[FS_KEY_DESCRIPTOR_SIZE];
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};
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#define FS_CTX_REQUIRES_FREE_ENCRYPT_FL 0x00000001
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#define FS_WRITE_PATH_FL 0x00000002
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struct fscrypt_completion_result {
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struct completion completion;
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int res;
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};
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#define DECLARE_FS_COMPLETION_RESULT(ecr) \
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struct fscrypt_completion_result ecr = { \
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COMPLETION_INITIALIZER((ecr).completion), 0 }
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/* crypto.c */
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int fscrypt_initialize(unsigned int cop_flags);
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/* keyinfo.c */
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extern int fscrypt_get_crypt_info(struct inode *);
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#endif /* _FSCRYPT_PRIVATE_H */
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